Aminocarbonylation of alkenyl iodides with CO and amines proceeded under heating to produce α,β-unsaturatedamides in good yields (23 examples, 71% average yield). This catalyst-free method exhibited good functional-group tolerance, and open a straightforward access to functionalized acrylamides, as illustrated by the synthesis of Ilepcimide. A hybrid radical/ionic mechanism involving chain electron transfer is
烯基碘与 CO 和胺的氨基羰基化在加热下进行,以良好的产率(23 个实例,71% 的平均产率)产生 α,β-不饱和酰胺。这种无催化剂的方法表现出良好的官能团耐受性,并打开了对官能化丙烯酰胺的直接访问,如 Ilepcimide 的合成所示。针对这种转变提出了一种涉及链式电子转移的混合自由基/离子机制。
Sequential C sp 3H Arylation and Olefination: Total Synthesis of the Proposed Structure of Pipercyclobutanamide A
作者:Will R. Gutekunst、Ryan Gianatassio、Phil S. Baran
DOI:10.1002/anie.201203897
日期:2012.7.23
square: A strategy for assembling tetrasubstituted cyclobutanes is reported in the context of a short, protecting‐group‐free synthesis of the proposedstructure of pipercyclobutanamide A. The route features sequentialCH functionalizations on an unactivated cyclobutane wherein CC bonds to aryl and styryl groups are made one by one in a stereocontrolled fashion. DG=directing group.
Hip to be square:在一个短的、无保护基团合成哌环丁酰胺 A 结构的背景下,报道了一种组装四取代环丁烷的策略。该路线的特点是在未活化的环丁烷上连续 C H 官能化,其中 C C与芳基和苯乙烯基的键以立体控制的方式一个接一个地形成。DG=指导组。
Cyclic Vinyl(aryl)iodonium Salts: Synthesis and Reactivity
作者:Konrad Kepski、Craig R. Rice、Wesley J. Moran
DOI:10.1021/acs.orglett.9b02540
日期:2019.9.6
A convenient, highly regioselective synthesis of five-membered cyclic vinyl(aryl)iodoniumsalts directly from β-iodostyrenes is presented. An X-ray crystal structure confirms the identity of these heterocycles. These λ3-iodanes can be converted rapidly into functionalized arylacetylenes by treatment with mild base or undergo SNV reactions with nonbasic nucleophiles.
Desymmetrization of gem-dimethyl groups has been developed as an efficient pathway to achieve asymmetric C(sp3)–H functionalization. Herein, we described a Pd(II)-catalyzed desymmetrizing gem-dimethyl C(sp3)–H alkenylation/aza-Wacker cyclization directed by a bidentate 2-pyridinylisopropyl auxiliary. Chiral α-methyl γ-lactams were obtained in good yields (up to 82%) and high enantioselectivities (up
Applications of C–H Functionalization Logic to Cyclobutane Synthesis
作者:Will R. Gutekunst、Phil S. Baran
DOI:10.1021/jo4027148
日期:2014.3.21
The application of C-H functionalization logic to target-oriented synthesis provides an exciting new venue for the development of new and useful strategies in organic chemistry. In this article, C-H functionalization reactions are explored as an alternative approach to access pseudodimeric cyclobutane natural products, such as the dictazole and the piperarborenine families. The use of these strategies in a variety of complex settings highlights the subtle geometric, steric, and electronic effects at play in the auxiliary guided C-H fimctionalization of cyclobutanes.